Stargazer adjusted ready-made refractor’s tip (10)
I believe the answer is:
daydreamer
'stargazer' is the definition.
'adjusted ready-made refractor's tip' is the wordplay.
'adjusted' is an anagram indicator.
'tip' indicates one should take the final letters.
The final letter of 'refractor' is 'r'.
'ready'+'made'='readymade'
'readymade' anagrammed gives 'daydreame'.
'daydreame'+'r'='DAYDREAMER'
(Other definitions for daydreamer that I've seen before include "Fantasist" , "One in a reverie" , "One distracted from the present" , "One letting their mind wander" , "Wishful thinker" .)